Interaction.requires_action webhook never delivered (interaction.completed/failed work fine)

Gemini API
, ,
1 
Title: interaction.requires_action webhook never delivered (interaction.completed/failed work fine)

Body:

I have a static, `enabled` webhook registered on the Interactions API, subscribed to all three
documented interaction events. `interaction.completed` and `interaction.failed` deliver reliably.
`interaction.requires_action` never delivers at all, even though the interaction genuinely reaches
that status (confirmed via `GET`) and the endpoint is confirmed reachable.

**Webhook registration** (confirmed via `client.webhooks.list()` / `get()`, python-genai SDK):

```
id=jz1heeksjz09unxtgchayox8vyp4djog6u61
state=enabled
subscribed_events=['interaction.requires_action', 'interaction.completed', 'interaction.failed']
uri=https://relic-chastity-outcome.ngrok-free.dev/internal/gemini-webhook
```

**Reproduction:**
1. Created an agent interaction (`agent=antigravity-preview-05-2026`) with a `request_human_input`
   function tool and a prompt engineered to call it immediately, `background=true`,
   `store=true`, and (in addition to the static webhook above) a per-request
   `webhook_config={"uris": ["https://relic-chastity-outcome.ngrok-free.dev/internal/gemini-webhook"]}`.
   Interaction id: `v1_ChcybkNWYXF1M0tKLUxqdU1QM2VDTWdBZxIXMm5DVmFxdTNLSi1ManVNUDNlQ01nQWc`.

2. Polled with `GET` - interaction reached `status=requires_action` at `2026-08-31T12:17:54Z`
   (22 seconds after creation) and stayed there.

3. A standalone HTTP listener was running at that exact URI the whole time (not the app itself -
   isolated purely to rule out any app-side bug). A manual test POST to the same URI at
   `2026-08-31T12:17:15Z` was received and logged correctly, confirming the endpoint was live and
   reachable throughout the test.

4. No webhook delivery was received for this interaction - not for the static webhook, not for
   the per-request dynamic `webhook_config` - for over 10 minutes after it reached
   `requires_action`, and none arrived on retry either.

For comparison, `interaction.completed`/`interaction.failed` on the same static webhook have
delivered correctly and promptly for other interactions in this project.

**Ask:** please confirm whether `interaction.requires_action` delivery is currently broken, or
whether there's an additional prerequisite beyond subscribing to it (on either the static webhook
or per-request `webhook_config`) that isn't documented at https://ai.google.dev/api/webhooks.

Related: this looks like the same category of bug reported and fixed here for
`interaction.completed` on a dynamic webhook:
https://discuss.ai.google.dev/t/dynamic-webhooks-not-firing/175903
2

Hello @Hemant_Nagpure ,

Thanks for reporting this. We have routed this issue to our engineering team for investigation. In the meantime, please check the interaction status by polling GET /v1beta/interactions/{id} as a temporary workaround. We will share updates as soon as we have more information